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2" Golf/Tennis Ball Shoulder Launched Cannon + Damage!

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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2" Golf/Tennis Ball Shoulder Launched Cannon + Damage!

Unread postAuthor: Jabingo19 » Sun Jul 31, 2011 7:43 pm

Alright, so this is my second pneumatic gun, the first one I made was a 1.5" piston valve gun which was... well, quite frankly, it was crap. Now, I present the fruits of my labor:

2" piston valve with 1.5" porting, piloted by 3/4" sprinkler
~5' chamber, 2" PVC
Interchangeable barrels
-4' 2.5" Tennis ball barrel with 1.5" female adapter in the base
-4'8" 1.5" SDR-21 barrel, threads into the tennis ball barrel for support
Ergonomic to hold
Pressure gauge (yeah, it goes to 300 psi... It was for an older gun I had planned :wink: )
Quick disconnect with a check valve (might replace it with a ball valve, haven't decided)

And now, pictures (+ some damage shots!)


EDIT: Videos!!!

[youtube]http://www.youtube.com/watch?v=xyubeYqlXOo[/youtube]
[youtube]http://www.youtube.com/watch?v=dbpIF4cbvGQ[/youtube]
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Attachments
Photo Jul 31, 6 38 03 PM.jpg
Distance of shots (you can see the gun next to my garage)
Photo Jul 31, 6 37 35 PM.jpg
Thickness of pallet shot at
Photo Jul 31, 6 33 44 PM.jpg
Golf ball just hit an edge
Photo Jul 31, 6 33 37 PM.jpg
Solid-ish shot
Photo Jul 31, 6 33 29 PM.jpg
Tennis ball actually took out an entire board. This really surprised me.
Photo Jul 31, 6 25 59 PM.jpg
Pressure gauge and quick disconnect
Photo Jul 31, 6 26 36 PM.jpg
Modded Orbit 3/4" sprinkler
Photo Jul 31, 6 27 06 PM.jpg
Piston face (my camera hates focusing on what I want it to) I would take out the piston but I just tightened everything up, nylon piston with half a tennis ball bumper
Photo Jul 31, 6 25 04 PM.jpg
Right side and both barrels
Photo Jul 31, 6 25 24 PM.jpg
Left side and both barrels
Photo Jul 31, 6 31 11 PM.jpg
Entire gun
Shoulder Launched.jpg
Shoulder Launched, Very Ergonomic
Photo Aug 09, 10 30 22 PM (640 x 960).jpg
Figured that while I had the gun apart to make the repairs (just need a PVC tee, should be done tomorrow night) I would post some pictures of my piston.
Photo Aug 09, 10 30 07 PM (640 x 960).jpg
Here's the new bumper I will be using, so that the back hopefully doesn't come flying off the gun again. The top layer is a thick plastic-type styrafoam that doesn't break apart into annoying little balls, and the bottom is a dense rubber foam.
Photo Aug 09, 10 35 04 PM (640 x 960).jpg
Equalization hole
Photo Aug 09, 10 35 19 PM (640 x 960).jpg
Back of piston bored out to save weight
Photo Aug 11, 7 54 03 PM (750 x 560).jpg
New paint job and everything put back together. Looks super slick (at least I think so :D)
Last edited by Jabingo19 on Thu Aug 11, 2011 8:04 pm, edited 3 times in total.
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Unread postAuthor: saefroch » Sun Jul 31, 2011 7:58 pm

Wow... that's... amazing. Don't know what else to say. Incredible all-around build. Awkward chamber dimensions may be hampering flow, but that's the best I can come up with for helpful suggestions.
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Unread postAuthor: Technician1002 » Sun Jul 31, 2011 8:13 pm

Piston face (my camera hates focusing on what I want it to) I would take out the piston but I just tightened everything up, nylon piston with half a tennis ball bumper


Edit found better photo
Camera trick. Move the camera away from what you want by the distance it is improperly auto focusing. For example if it is focusing on the end of the pipe, let it. Half press the shutter to lock the focus, and move the camera back closer so it focuses on the desired piston, then finish pressing the shutter. Many of my QDV piston and port photos were taken that way.
Sample photo taken by focusing on the end of the pipe and then moving the camera in close to move the focus to the piston.
Image

The cannon looks to be made with a bunch of short socket DWV fittings. The street elbows and other parts is a serious safety item. There is no sign of primer. Was that used? Other than problems with materials used, it is looking good.
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Last edited by Technician1002 on Mon Aug 01, 2011 12:06 am, edited 2 times in total.
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Unread postAuthor: mattyzip77 » Sun Jul 31, 2011 8:16 pm

Holy crap dude, that thing has more fittings on it than McMasters has in stock, lol!!! Awesome build though. How many p s i are you running that at?? Now you just need to paint it and give it a name!! Scale of 1 to 10 I give it a 8!! You may be losing power with that long length of hose you got there!!!
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Last edited by mattyzip77 on Sun Jul 31, 2011 8:18 pm, edited 1 time in total.
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Unread postAuthor: Jabingo19 » Sun Jul 31, 2011 8:17 pm

I actually work at a swimming pool distributor, and all of the PVC we get is required by state law to be pressure rated, so they are pressure rated street elbows and all of the fittings are correct length. This also explains the primer issue, everything is clear primered. Appreciate the concerns though (that sounded really sarcastic, I'm not trying to be :lol: )
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Unread postAuthor: Jabingo19 » Sun Jul 31, 2011 8:19 pm

And matty my compressor goes up to 115 psi, that what I'm running at.
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Unread postAuthor: saefroch » Sun Jul 31, 2011 8:33 pm

Probably no power loss at all due to the long hose, since that's the pilot's pilot volume. :p
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Unread postAuthor: Jabingo19 » Sun Jul 31, 2011 8:35 pm

Haha yeah I'm not too worried about the pilot's pilot causing a loss of power, and oh and sorry I forgot to thank you for your comments before saefroch, appreciate it.
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Unread postAuthor: daniel0663 » Sun Jul 31, 2011 11:28 pm

Yeeeh man, looks really good.
Never really seen this kind of shape and design before, on a spudgun. :wink:

Not bad at all for a second cannon. :P
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Unread postAuthor: Jabingo19 » Sun Jul 31, 2011 11:34 pm

Thanks daniel yeah I was trying to do something that both made sense and I hadn't seen before.
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Unread postAuthor: MrCrowley » Sun Jul 31, 2011 11:52 pm

Nice build. Unique design, must've cost a lot in fittings :wink:

Looking forward to a damage video.
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Unread postAuthor: Jabingo19 » Mon Aug 01, 2011 12:12 am

Yeah luckily at my job spare fittings are readily available, the whole gun only ended up costing me $50, which I don't think is bad at all for the (okay slightly ridiculous) amount of fittings I have. And I will get a damage vid up when I can, problem is that I work early to late (sunlight) most days of the week. But I'll do what I can for sure.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 01, 2011 12:47 am

All that for $50? Good job if you're into spudguns :)

Nicely put together, and well thought out ergonomics. With those specs it has a lot more destructive potential than simply perforating relatively weak pine boards.

Remember, the joy of pneumatics is that practically anything which fits in the barrel is suitable as a projectile ;)

With a side-mounted scope, muzzle brake and suitable paint job... just sayin'

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Unread postAuthor: Jabingo19 » Mon Aug 01, 2011 9:33 am

Yeah trust me, I know how lucky I am to work there. But yes, I would hope it would have more destructive potential than a few pine boards with the muzzle energy of a colt peacemaker :lol:

And I absolutely plan on painting it up and a side mounted scope would be amazing.

Also jsr, when you say anything that fits down the barrel, do you mean something...
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Photo Oct 22, 7 07 29 PM (1).jpg
... like this? ;)
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Unread postAuthor: Jabingo19 » Mon Aug 01, 2011 9:31 pm

Bump for damage videos!
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